Bootcamp Pure Gaming: Vista Ultimate vs. Win. 7 RC? HDD?

1. I have the UMBP, the 2.4Ghz edition, with 2GB of Ram. I was wondering whether I should install Windows 7 RC or Vista Ultimate for bootcamp? It will be used primarily for gaming. Call of Duty 4 & 5 would probably be the most intense I'll play for now So which OS will help me run these games at the best they can on the 2.4Ghz?

2. Also how much HDD should I dedicate to bootcamp? I had the 250GB HDD, and I have about 120GB left. Is about 60 enough? Do you recommend more? 70? 80? I really need someone with experience to help me out with this.

3. Also once I install said OS on bootcamp, windows update, and the CD that came with the mac should give me all the necessary drivers and stuff, right?

But I have Windows 7 installed and Im really impressed with the performance.
I did have a problem playing Unreal Tournament 3 because it kept crashing, but I ran it in Compatibility Mode set at XP SP2 and it worked fine.

Plus its free for a year!

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EDIT

Oh, you may have to download BootCamp 2.1 from the apple website depending on which version is on your OS X disk. I had to do that, 2.0 wouldnt work with Windows 7.

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